Isokinetics and Exercise Science最新文献_第10页

Hip and ankle strength and range of motion in female soccer players with dynamic knee valgus 女足球运动员动态膝外翻的髋关节和踝关节力量和活动范围

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-06-04 DOI: 10.3233/IES-200260

Y. Jo, Young Kyun Kim

{"title":"Hip and ankle strength and range of motion in female soccer players with dynamic knee valgus","authors":"Y. Jo, Young Kyun Kim","doi":"10.3233/IES-200260","DOIUrl":"https://doi.org/10.3233/IES-200260","url":null,"abstract":"BACKGROUND: Dynamic knee valgus (DKV) is a known risk factor for acute and chronic knee injuries and is more frequently diagnosed in females. A real-time single-leg squat test (SLST) could screen for DKV to prevent injuries. OBJECTIVE: To compare the differences in lower extremity strength and range of motion (ROM) in female soccer athletes with and without DKV during an SLST. METHODS: Eighteen subjects with DKV (DKV group) and 18 subjects without DKV (control group) during a single-leg squat were included. Hip strength (flexion, extension, abduction, adduction, internal rotation, and external rotation) was measured with a hand-held dynamometer. Hip ROM (internal and external rotation), and ankle ROM (dorsiflexion with the knee flexed and extended) were measured. Independent t-test was used to compare the averages of the groups. RESULTS: There were significant differences in hip abduction to adduction strength ratio (DKV: 1.48 ± 0.3, control: 1.22 ± 0.26, p< 0.01) and ankle dorsiflexion with knee flexed (DKV: 17.22 ± 6.82, control: 21.22 ± 4.55, p< 0.05) and extended (DKV: 10.14 ± 4.23, control: 14.75 ± 3.40, p< 0.001) between the groups. CONCLUSION: The hip abduction to adduction strength ratio and gastrocnemius and soleus flexibility may be associated factors in dynamic knee valgus and therefore should be assessed and treated, if indicated, as a possible preventive measure in female athletes with this variation.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.7,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-200260","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42816566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players 日本大学美式足球运动员的身体和表现特征与首发状态、位置和分区有关

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-05-28 DOI: 10.3233/IES-200222

J. Iguchi, M. Matsunami, T. Hojo, Y. Fujisawa, K. Kuzuhara, Yasuhiro Yuasa, Toshiya Kitazawa

{"title":"Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players","authors":"J. Iguchi, M. Matsunami, T. Hojo, Y. Fujisawa, K. Kuzuhara, Yasuhiro Yuasa, Toshiya Kitazawa","doi":"10.3233/IES-200222","DOIUrl":"https://doi.org/10.3233/IES-200222","url":null,"abstract":"BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":"1 1","pages":"1-8"},"PeriodicalIF":0.7,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-200222","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46832768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between explosive strength characteristics with change of direction speed in junior and cadet karate athletes 青少年空手道运动员爆发力特征与方向速度变化的关系

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-05-28 DOI: 10.3233/IES-210114

Alex Ojeda-Aravena, T. Herrera-Valenzuela, P. Valdés-Badilla, Jairo Azócar-Gallardo, Victor Campos-Uribe, J. M. García-García

{"title":"Relationship between explosive strength characteristics with change of direction speed in junior and cadet karate athletes","authors":"Alex Ojeda-Aravena, T. Herrera-Valenzuela, P. Valdés-Badilla, Jairo Azócar-Gallardo, Victor Campos-Uribe, J. M. García-García","doi":"10.3233/IES-210114","DOIUrl":"https://doi.org/10.3233/IES-210114","url":null,"abstract":"BACKGROUND: Explosive strength and change of direction speed (CODS) are relevant physical abilities in karate. OBJECTIVE: To examine the relationship between the characteristics of explosive strength and the 5-m linear sprint (5M) with CODS performance and ii) to examine the influential characteristics of explosive strength on CODS performance. METHODS: Eighteen cadet and junior karate athletes, eight females and ten males were evaluated. The physical abilities assessments included: squat jump (SJ), countermovement jump (CMJ), 5M and CODS. Also, pre-stretch percentage increase (PSA), eccentric utilization index (EUR) reactive strength index (RSI) were calculated. RESULTS: Superior performance (p< 0.05) was documented in SJ, CMJ and CODS in male vs. female. Also, significant correlations between CODS with SJ and CMJ (r=-0.70 to -0.80; R2=-0.51 to -0.73; p< 0.05, respectively) and correlations (r=-0.14 to -0.22; R2= 0.01 to 0.04; p> 0.05) between CODS with RSI, EUR and PSA. Multiple regression model documented that only SJ significantly influenced CODS performance in male (R2= 60%; p= 0.009) and female (R2= 71%; p= 0.001). CONCLUSION: CODS correlate with SJ and CMJ. In particular, SJ influence CODS independently of gender.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":"1 1","pages":"1-10"},"PeriodicalIF":0.7,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-210114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49287577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Preseason shoulder rotational isokinetic strength and shoulder injuries in volleyball players 排球运动员季前赛肩部旋转等速力量与肩部损伤

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-04-16 DOI: 10.3233/IES-210127

V. Hadžić, E. Dervišević, P. Pori, A. Hadžić, T. Sattler

{"title":"Preseason shoulder rotational isokinetic strength and shoulder injuries in volleyball players","authors":"V. Hadžić, E. Dervišević, P. Pori, A. Hadžić, T. Sattler","doi":"10.3233/IES-210127","DOIUrl":"https://doi.org/10.3233/IES-210127","url":null,"abstract":"BACKGROUND: Rotator cuff weakness is considered an important risk factor for shoulder injuries in volleyball. OBJECTIVE: To evaluate association of shoulder preseason strength status with shoulder injury occurrence in subsequent season. METHODS: Volleyball players (N= 181; 99 men) from Slovenian 1st and 2nd national league volunteered to participate in this prospective cohort study. Preseason isokinetic testing of the shoulder was conducted at 60∘/s in the concentric mode of contraction over a RoM of 60∘ with five repetitions of internal (IR) and external (ER) rotation. During the subsequent season the players reported shoulders injuries through a weekly questionnaire. RESULTS: During the season we have registered 14 (7.7%) shoulder injuries (10 in men). All injuries affected the dominant shoulder. There was significant preseason weakness of ER and lower ER/IR strength ratio in players with shoulder injury. Normal strength ratio ER/IR was a significant protective factor (Exp (B) = 0.217, 95% C.I. 0.058–0.811) for shoulder injury occurrence when controlled for sex and previous injury. CONCLUSIONS: The inclusion of systematic strengthening of the external rotators of the shoulder is necessary, especially for male volleyball players, as part of preventive measures for the prevention of shoulder injuries.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":"1-6"},"PeriodicalIF":0.7,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-210127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43071108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correlation of paretic knee extension strength with gait speed after stroke: A meta-analysis 卒中后偏瘫伸膝力量与步态速度的相关性：荟萃分析

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-04-16 DOI: 10.3233/IES-210139

R. W. Bohannon

{"title":"Correlation of paretic knee extension strength with gait speed after stroke: A meta-analysis","authors":"R. W. Bohannon","doi":"10.3233/IES-210139","DOIUrl":"https://doi.org/10.3233/IES-210139","url":null,"abstract":"BACKGROUND AND OBJECTIVE: Numerous studies have addressed the relationship between paretic knee extension strength and comfortable walking speed after stroke. However, the correlations reported are highly variable. This review sought to summarize the correlational data using meta-analysis. METHODS: Relevant literature was identified via a search of 3 bibliographic databases. Articles were screened and perused for inclusion. Included articles were examined for information on the sample studied, procedures for measuring strength and gait speed, and correlations reported between the 2 variables. Meta-analysis was used to calculate a summary correlation. RESULTS: Of 299 unique articles, 18 met inclusion criteria. Articles were diverse in regard to samples studied, procedures described, and correlations reported. Meta-analysis using data from all included studies revealed a summary correlation of 0.51. For studies using hand-held or isokinetic dynamometry, the summary correlation was 0.46 and 0.59 respectively. CONCLUSIONS: This study provides a better indication of the correlation between paretic knee extension strength and comfortable gait speed than individual studies. The correlation is high enough to provide support for the routine measurement of paretic knee extension force for individuals who have experienced a stroke.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":"1-5"},"PeriodicalIF":0.7,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-210139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45653615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of lower limb muscle activity during the dynamic balance test between baseball pitchers and healthy young adults 棒球投手与健康青年在动态平衡测试中下肢肌肉活动的比较

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-04-09 DOI: 10.3233/ies-203163

J. Jeon, Ji-yeon Lee, Jiheon Hong, Jae-Ho Yu, JinSeop Kim, DongYeop Lee

引用次数: 0

A comparative study of the acute effects of knee brace vs. kinesiotape on selected isokinetic strength variables of the knee muscles 膝关节支架与驱动器对选定的膝关节等速力量变量的急性影响的比较研究

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-03-05 DOI: 10.3233/IES-200175

A. Yılmaz, M. Vural, M. Özdal, M. Kabadayı

{"title":"A comparative study of the acute effects of knee brace vs. kinesiotape on selected isokinetic strength variables of the knee muscles","authors":"A. Yılmaz, M. Vural, M. Özdal, M. Kabadayı","doi":"10.3233/IES-200175","DOIUrl":"https://doi.org/10.3233/IES-200175","url":null,"abstract":"BACKGROUND: Different methods of treatment for preventing knee injuries, enhancing knee strength and minimising post-injury risks have been explored. Among these methods, Kinesio tape (KT) and knee braces (KB) are commonly used. OBJECTIVE : To investigate the acute effects of KT and KB on isokinetic knee strength parameters. METHODS: A total of 15 healthy sedentary male subjects voluntarily participated in the study. Concentric isokinetic knee extension (EX) and flexion (FLX) strength were measured at three sessions: 1. Baseline 2. with KT (’KT’) 3. with KB (’KB’). Tests were performed at 60, 180 and 240∘/s. Peak moment (PM), Hamstring/Quadriceps ratio (HQR), and joint angle at peak moment (JAPM) were measured. RESULTS: ‘KT’ and ‘KB’ were associated with increase in PMEX, PMFLX, HQR at 60 and 240∘/s (p< 0.05) and increased JAPMEX. No significant difference was observed at 180∘/s (p> 0.05). CONCLUSION: In healthy individuals, ‘I’ shape KT and KB positively affect EX and FLX strengths and HQR, especially at low angular velocity.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":"1-6"},"PeriodicalIF":0.7,"publicationDate":"2021-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-200175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44370668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cues for coaching athletes during the COVID-19 second wave 在2019冠状病毒病第二波期间指导运动员的线索

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-02-01 DOI: 10.3233/ies-201230

S. Teodorescu, F. Dutheil, C. Urzeală

引用次数: 0

Comparison of single and multiple joint muscle functions and neural drive of trained athletes and untrained individuals 训练与未训练运动员单、多关节肌肉功能及神经驱动的比较

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-01-15 DOI: 10.3233/IES-203225

K. Mehmet

{"title":"Comparison of single and multiple joint muscle functions and neural drive of trained athletes and untrained individuals","authors":"K. Mehmet","doi":"10.3233/IES-203225","DOIUrl":"https://doi.org/10.3233/IES-203225","url":null,"abstract":"BACKGROUND: There is insufficient knowledge about the rate of force development (RFD) characteristics over both single and multiple joint movements and the electromechanical delay (EMD) values obtained in athletes and untrained individuals. OBJECTIVE: To compare single and multiple joint functions and the neural drive of trained athletes and untrained individuals. METHODS: Eight trained athletes and 10 untrained individuals voluntarily participated to the study. The neuromuscular performance was assessed during explosive and maximum voluntary isometric contractions during leg press and knee extension related to single and multiple joint. Explosive force and surface electromyography of eight superficial lower limb muscles were measured in five 50-ms time windows from their onset, and normalized to peak force and electromyography activity at maximum voluntary force, respectively. The EMD was determined from explosive voluntary contractions (EVC’s). RESULTS: The results showed that there were significant differences in absolute forces during knee extension maximum voluntary force and EVC’s (p< 0.01) while trained athletes achieved greater relative forces than untrained individuals of EVC at all five time points (p< 0.05). CONCLUSIONS: The differences in explosive performance between trained athletes and untrained individuals in both movements may be explained by different levels of muscle activation within groups, attributed to variation in biarticular muscle function over both activities.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":"1 1","pages":"1-11"},"PeriodicalIF":0.7,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/IES-203225","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42555417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of plyometric training on dynamic leg strength and jumping performance in rhythmic gymnastics: A preliminary study 增强式训练对艺术体操动态腿部力量和跳跃性能影响的初步研究

IF 0.7 4区医学

Isokinetics and Exercise Science Pub Date : 2021-01-01 DOI: 10.3233/ies-210148

N. Nitzsche, T. Siebert, H. Schulz, N. Stutzig

{"title":"Effect of plyometric training on dynamic leg strength and jumping performance in rhythmic gymnastics: A preliminary study","authors":"N. Nitzsche, T. Siebert, H. Schulz, N. Stutzig","doi":"10.3233/ies-210148","DOIUrl":"https://doi.org/10.3233/ies-210148","url":null,"abstract":"BACKGROUND: Reactive performance is an important component of rhythmic gymnastics. So far, it is unclear whether additional plyometric training in female gymnasts shows an increase in performance. OBJECTIVE: The aim of the study was to examine the effect of additional plyometric training in rhythmic gymnastics on the reactive jumping performance and strength of the lower leg muscles. METHODS: Fifteen rhythmic gymnasts (age: 12.3 ± 2.6 years, height: 1.47 ± 0.12 m, body weight: 37.3 ± 9.3 kg, BMI: 16.7 ± 2.1 kg*m-2; competition level: national and international championships, Tanner stages I–III) participated in the study. The athletes were assigned to an experimental (EG) and a control group (CG). The EG performed plyometric exercises three times per week in addition to the regular training. Before and after six weeks of training the reactive jump performance, the work of dorsi flexors and plantar flexors performed during isokinetic plantarflexion, as well as the performance in two sport-specific tests were measured. RESULTS: In contrast to the CG, in the EG the jump height (pre: 24.8; post: 27.25 cm; p< 0.05) and the reactive-strength-index (pre: 1.01; post: 1.19; p< 0.01) increased significantly. The EG achieved significant improvements in the counter movement jump test (pre: 27.0 cm; post: 31.5 cm; p< 0.01) and in the sport specific double rope jump test (jumps per minute, pre: 18.0; post: 23.0; p< 0.01). Furthermore, a significant increase in work performed during plantarflexion was found in the EG for the right leg (pre: 24.9 J; post: 29.7 J; p< 0.01) and a tendency to increase for the left leg (pre: 26.4 J; post: 37.7 J; p= 0.05). CONCLUSION: Both reactive strength and dynamic force can be efficiently increased by plyometric training. It may be recommended to include plyometric exercises in the training regime of rhythmic gymnasts.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/ies-210148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69955824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3